{"id":1653,"date":"2023-01-15T19:59:10","date_gmt":"2023-01-15T10:59:10","guid":{"rendered":"http:\/\/fpga.cool.coocan.jp\/wordpress\/?p=1653"},"modified":"2023-02-19T12:24:05","modified_gmt":"2023-02-19T03:24:05","slug":"dsd%e3%81%9d%e3%81%ae%e3%81%be%e3%81%be%e5%87%ba%e5%8a%9b-dac","status":"publish","type":"post","link":"http:\/\/fpga.cool.coocan.jp\/wordpress\/?p=1653","title":{"rendered":"DSD discrete analog FIR filter DAC"},"content":{"rendered":"\n

<\/p>\n\n\n\n

\u3053\u3061\u3089\u306e\u30b5\u30a4\u30c8<\/a>\u306b\u3001\u5f53\u65b9\u304c\u904e\u53bb\u306b\u914d\u5e03\u3055\u305b\u3066\u3044\u305f\u3060\u3044\u305f\u300cDSD\u539f\u7406\u57fa\u677f\u300d\u3092\u7528\u3044\u3066DSD DAC\u3092\u4f5c\u6210\u3057\u305f\u65b9\u304c\u3001\u30a2\u30ca\u30ed\u30b0\u51fa\u529b\u306e\u6e2c\u5b9a\u30c7\u30fc\u30bf\u3092\u516c\u8868\u3055\u308c\u3066\u3044\u308b\u306e\u3092\u5076\u7136\u767a\u898b\u3057\u307e\u3057\u305f\u3002WaveSpectra\u306b\u3088\u308bFFT\u306e\u30c1\u30e3\u30fc\u30c8\u3067\u3059\u304c\u3001\u78ba\u304b\u306b\u3001\u6982\u306d\u3042\u306e\u3088\u3046\u306a\u611f\u3058\u306b\u306a\u3063\u3066\u3044\u308b\u306e\u3060\u308d\u3046\u3068\u601d\u3044\u307e\u3057\u305f\u3002<\/p>\n\n\n\n

DSD\u306e analog FIR filter\u306b\u3088\u308bD\/A\u5909\u63db\u65b9\u5f0f\u306b\u3064\u3044\u3066\u306f\u3001\u300cDSD\u539f\u7406\u57fa\u677f\u300d\u306e\u30ea\u30ea\u30fc\u30b9\u5f8c\u306b\u3001\u672c\u5bb6\u306e\u65b9\u304b\u3089\u7406\u8ad6\u7684\u30fb\u6280\u8853\u7684\u306a\u3054\u6559\u793a\u3092\u8cdc\u3063\u305f\u3053\u3068\u304c\u3042\u308a\u3001\u305d\u306e\u6642\u306b\u5f97\u3089\u308c\u305f\u77e5\u898b\u3092\u5143\u306b\u3001\u300cDSD\u539f\u7406\u57fa\u677f\u300d\u3088\u308a\u9ad8\u6027\u80fd\u306aanalog FIR filter DAC\u3092\u69cb\u6210\u53ef\u80fd\u3067\u3042\u308b\u3068\u3044\u3046\u5b9f\u8a3c\u5b9f\u9a13\u306f\u6e08\u307e\u305b\u3066\u304a\u308a\u307e\u3057\u305f\u3002<\/p>\n\n\n\n

\u305b\u3063\u304b\u304f\u306a\u306e\u3067\u304d\u3061\u3093\u3068\u5f62\u306b\u3057\u3066\u6b8b\u3057\u3066\u304a\u3053\u3046\u3068\u601d\u3044\u3064\u3064\u3001\u81ea\u4f5c\u30aa\u30fc\u30c7\u30a3\u30aa\u6d3b\u52d5\u306e\u4e2d\u65ad\u3067\u30a6\u30e4\u30e0\u30e4\u306b\u306a\u3063\u3066\u304a\u308a\u307e\u3057\u305f\u3002\u305d\u308c\u304b\u3089\u3042\u3063\u3068\u3044\u3046\u9593\u306b\u6570\u5e74\u304c\u7d4c\u904e\u3057\u3066\u3057\u307e\u3044\u307e\u3057\u305f\u304c\u3001\u305d\u306e\u4ed6\u3001\u3044\u304f\u3064\u304b\u4e2d\u65ad\u4e2d\u3067\u5fc3\u6b8b\u308a\u306e\u30d7\u30ed\u30c8\u306a\u3069\u3082\u3042\u308a\u307e\u3059\u306e\u3067\u3001\u3053\u306e\u969b\u3001\u305d\u308c\u3060\u3051\u3067\u3082\u30b3\u30ed\u30ca\u660e\u3051\uff1f\u306e\u4eca\u5e74\u304b\u3089\u5c11\u3057\u3065\u3064\u5f62\u306b\u3057\u3066\u3044\u3051\u308c\u3070\u3068\u601d\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n

\u9014\u4e2d\u4f11\u307f\u4f11\u307f\u3067\u3057\u305f\u304c\u3001\u3053\u306e\u305f\u3073\u5f62\u306b\u3057\u305f\u3001\u300cDSD discrete analog FIR filter DAC\u300d\u3067\u306f\u3001DSD\u30c7\u30fc\u30bf\u306e “\u30b7\u30f3\u30dc\u30eb1” \u3068 “\u30b7\u30f3\u30dc\u30eb0” \u3068\u306e\u76f8\u4e92\u5e72\u6e09\u306b\u3088\u308b\u53ef\u8074\u5e2f\u57df\u3067\u306e\u6df7\u5909\u8abf\u6b6a\u306e\u5897\u52a0\u3084S\/N\u306e\u4f4e\u4e0b\u3092\u9632\u3050\u305f\u3081\u306b\u3001DSD\u30c7\u30fc\u30bf\u305d\u306e\u307e\u307e\u306e\u4fe1\u53f7\u3092FIR filter\u306b\u901a\u3059\u306e\u3067\u306f\u306a\u304f\u3001DSD\u30c7\u30fc\u30bf\u306b\u6ce2\u5f62\u6574\u5f62\u51e6\u7406\u3092\u65bd\u3057\u3066\u304b\u3089FIR filter\u306b\u3088\u308b\u51e6\u7406\u3092\u884c\u3046\u3088\u3046\u306b\u69cb\u6210\u3057\u305f\u56de\u8def\u306b\u5909\u66f4\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u3063\u3066\u30ce\u30a4\u30ba\u30d5\u30ed\u30a2\u3092\u5927\u304d\u304f\u4e0b\u3052\u308b\u3053\u3068\u304c\u51fa\u6765\u307e\u3057\u305f\u3002<\/p>\n\n\n\n

\u5b9f\u6a5f\u3067\u306eFFT\u306f\u4e0b\u8a18\u306e\u30c1\u30e3\u30fc\u30c8\u306e\u901a\u308a\u3067\u3059\uff08\u5ff5\u306e\u305f\u3081\u3067\u3059\u304c\u3001I\/V\u5909\u63db\u3084LPF\u3092\u901a\u3057\u305f\u3042\u3068\u306e\u30a2\u30ca\u30ed\u30b0\u4fe1\u53f7\u3092\u898b\u3066\u3044\u307e\u3059\uff09\u3002\u3042\u304f\u307e\u3067\u3082\u3001DSD\u4fe1\u53f7\u3092\u307e\u3055\u306b\u30a2\u30ca\u30ed\u30b0\u306b\u5909\u63db\u3059\u308b\u30b9\u30c6\u30fc\u30b8\u306e\u8a71\u306b\u306a\u308a\u307e\u3059\u3002\u30c7\u30b8\u30bf\u30eb\u306e\u30d5\u30a1\u30a4\u30eb\u3068\u3057\u3066\u306eDSD\u30c7\u30fc\u30bf\u3092DSD\u5bfe\u5fdc\u306eDAC IC\u306b\u5165\u529b\u3059\u308b\u307e\u3067\u306e\u30c7\u30b8\u30bf\u30eb\u4fe1\u53f7\u51e6\u7406\u306e\u8a71\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n\n\n\n

\u3055\u3066\u3001\u3053\u306e\u300cDSD discrete analog FIR filter DAC\u300d\u306e\u300c\u30a2\u30ca\u30ed\u30b0\u300d\u51fa\u529b\u3092WAVE\u30d5\u30a1\u30a4\u30eb\u3068\u3057\u3066\u30ad\u30e3\u30d7\u30c1\u30e3\u3057\u305f\u3082\u306e\u304c\u3053\u3061\u3089<\/a>\u3067\u3059\u3002WaveSpectra\u306a\u3069\u3067\u3001\u7a93\u95a2\u6570\uff1aBlackman-Harris 7 Term\u3001\u30b5\u30f3\u30d7\u30eb\u30c7\u30fc\u30bf\u6570\uff1a128k\u3068\u3057\u3066\u518d\u751f\u3057\u3066\u3044\u305f\u3060\u3051\u308c\u3070\u3001\u3053\u306e\u30aa\u30fc\u30c7\u30a3\u30aa\u30fb\u30d7\u30ec\u30b7\u30b8\u30e7\u30f3\u306b\u3088\u308b\u30c1\u30e3\u30fc\u30c8\u3068\u540c\u3058\u3088\u3046\u306a\u611f\u3058\u306b\u898b\u3048\u308b\u304b\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n

\"DSD<\/figure>\n\n\n\n

I\/V\u5909\u63db\u3084\u305d\u308c\u306b\u7d9a\u304f\u591a\u91cd\u5e30\u9084LPF\u306f\u30aa\u30da\u30a2\u30f3\u30d7\u3067\u3042\u308bOPA134U\u3092\u4f7f\u3063\u305f\u3054\u304f\u5e73\u51e1\u306a\u56de\u8def\u3067\u3059\u3002<\/p>\n\n\n\n

DSD\u4fe1\u53f7\u306fPC\u304b\u3089\u81ea\u524d\u306eUSB DDC\u306a\u3069\u3092\u901a\u3058\u3066\u53d6\u308a\u51fa\u3057\u305f\u3082\u306e\u3092\u55b0\u308f\u305b\u3066\u304a\u308a\u307e\u3059\u3002\u30d4\u30e5\u30a2DSD\u306e2.8MHz\u30c6\u30b9\u30c8\u4fe1\u53f7\u3084\u300144.\uff11kHz\u304b\u30892.8MHz\u306eDSD\u306b\u5909\u63db\u3057\u305f\u3082\u306e\u3001\u3055\u3089\u306b\u306f88.2kHz\u304b\u30895.6MHz\u306b\u5909\u63db\u3057\u305f\u4fe1\u53f7\u3001\u3069\u308c\u3067\u3082\u6982\u306d\u540c\u3058\u3088\u3046\u306aspec\u3067\u30a2\u30ca\u30ed\u30b0\u306b\u5909\u63db\u3067\u304d\u3066\u3044\u307e\u3059\u3002\u305d\u308c\u4ee5\u4e0a\u9ad8\u3044\u30ec\u30fc\u30c8\u306eDSD\u4fe1\u53f7\u306b\u95a2\u3057\u3066\u306f\u307e\u3060\u30c6\u30b9\u30c8\u3057\u3066\u3044\u307e\u305b\u3093\u304c\u3001\u671f\u5f85\u3057\u305f\u6027\u80fd\u304c\u51fa\u308b\u304b\u3069\u3046\u304b\u306f\u3001discrete\u56de\u8def\u6700\u7d42\u6bb5\u306eIC\u306e\u6700\u7d42\u6bb5MOS\u30c8\u30e9\u30f3\u30b8\u30b9\u30bf\u306e\u5410\u304d\u51fa\u3057\u30fb\u5438\u3044\u8fbc\u307f\u6027\u80fd\u306e\u5bfe\u79f0\u6027\u306a\u3069\u306b\u4f9d\u5b58\u3059\u308b\u3088\u3046\u3067\u3059\u3002<\/p>\n\n\n\n

AKM\u306e\u5de5\u5834\u88ab\u707d\u306e\u4ef6\u306a\u3069\u3082\u3042\u3063\u3066\u3001\u30aa\u30fc\u30c7\u30a3\u30aa\u5c02\u7528\u90e8\u54c1\u3092\u4e00\u5207\u4f7f\u308f\u305a\u306b\u5168\u57fa\u677f\u3092\u8a2d\u8a08\u3057\u305f\u306e\u3067\u3059\u304c\u3001\u4f55\u306e\u5909\u54f2\u3082\u306a\u3044\u3088\u3046\u306a\u30ed\u30b8\u30c3\u30afIC\u307e\u3067\u5168\u304f\u624b\u306b\u5165\u3089\u306a\u3044\u3053\u3068\u304c\u591a\u304f\u3001\u4e00\u4f53\u3069\u3046\u306a\u3063\u3066\u3057\u307e\u3063\u305f\u306e\u3067\u3057\u3087\u3046\u304b\u3002Fab\u304c\u6700\u5148\u7aef\u306e\u30b9\u30de\u30db\u7528CPU\u306b\u3057\u304b\u30ad\u30e3\u30d1\u3092\u5272\u308a\u5f53\u3066\u306a\u3044\u304b\u3089\u306a\u306e\u3067\u3057\u3087\u3046\u304b\uff1f<\/p>\n\n\n\n

\u304a\u9670\u3067\u3001\u624b\u6301\u3061\u90e8\u54c1\u3084\u3089\u306a\u3093\u3068\u304b\u624b\u306b\u5165\u308a\u305d\u3046\u306a\u90e8\u54c1\u3084\u3089\u3092\u4f7f\u3063\u305f\u6570\u7a2e\u985e\u306e\u56de\u8def\u69cb\u6210\u3067\u8907\u6570\u7a2e\u306e\u57fa\u677f\u3092\u4f5c\u3063\u3066\u5b9f\u9a13\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u3093\u306a\u306b\u305f\u304f\u3055\u3093\u306e\u57fa\u677f\u3092\u63cf\u304f\u306e\u306f\u4e45\u3057\u3076\u308a\u3067\u3059\u3002\u3061\u306a\u307f\u306bIntel\u3084Xilinx\u306e\u624b\u9803\u306aFPGA\u306a\u3093\u304b\u5168\u304f\u5165\u624b\u3067\u304d\u306a\u3044\u306e\u3067\u6ce3\u3051\u3066\u304d\u307e\u3059\u3002<\/p>\n\n\n\n

\"DSD<\/figure>\n\n\n\n

\u6a19\u6e96\u30ed\u30b8\u30c3\u30af\u306e574\u3092\u4f7f\u3063\u3066\u30c0\u30d6\u30eb\u30fb\u30c7\u30a3\u30d5\u30a1\u30ec\u30f3\u30b7\u30e3\u30eb\u51fa\u529b\u306b\u3059\u308b\u306e\u3067\u3001\u30d1\u30bf\u30fc\u30f3\u3092\u5408\u7406\u7684\u306b\u5f15\u3053\u3046\u3068\u3059\u308b\u3068\u3069\u3046\u3057\u3066\u3082\u3053\u306e\u3088\u3046\u306b\u306a\u3063\u3066\u3057\u307e\u3044\u307e\u3059(\u4e2d\u592e\u306e\u57fa\u677f\u304cdiscrete DAC\u306b\u306a\u308a\u307e\u3059)\u3002DSD\u4fe1\u53f7\u306e\u6ce2\u5f62\u6574\u5f62\u7528CPLD\u306fIntel(Altera)\u88fd\u3067\u3059\u3002\u30d4\u30f3\u30d4\u30c3\u30c1\u304c0.4m\u3057\u304b\u306a\u3044\u306e\u3067\u5b9f\u88c5\u306f\u5927\u5909\u3067\u3059\u3002\u30cf\u30f3\u30c0\u9762\u306b\u306f\u30c1\u30c3\u30d7\u30b1\u30df\u30b3\u30f3\u304c\u6797\u7acb\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n

\u6b21\u306e\u5199\u771f\u306f\u51fa\u529b\u6bb5\u306e\u30c7\u30d0\u30a4\u30b9\u3092\u30b7\u30f3\u30b0\u30eb\u30bf\u30a4\u30d7\u306b\u5909\u66f4\u3057\u305f\u3082\u306e\u3067\u3059\u3002\u534a\u5206\u306fCPLD\u306e\u624b\u6301\u3061\u5728\u5eab\u306e\u4e8b\u60c5\u304b\u3089\u3053\u306e\u30d1\u30bf\u30fc\u30f3\u3082\u8a66\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u3061\u3089\u306fXilinx\u306eCPLD\u3002\u4f7f\u3044\u52dd\u624b\u306e\u3061\u3087\u3046\u3069\u826f\u3044CPLD\u3082\u3001\u30c7\u30a3\u30b9\u30b3\u30f3\u3084\u3089\u30b3\u30ed\u30ca\u3084\u3089\uff1f\u3067\u5e02\u5834\u304b\u3089\u59ff\u3092\u6d88\u3057\u3066\u4e45\u3057\u3044\u3067\u3059\u306d\u3002\u6ce3\u3051\u3066\u304d\u307e\u3059(\u7b11\u3002<\/p>\n\n\n\n

\"\"<\/figure>\n","protected":false},"excerpt":{"rendered":"

\u3053\u3061\u3089\u306e\u30b5\u30a4\u30c8\u306b\u3001\u5f53\u65b9\u304c\u904e\u53bb\u306b\u914d\u5e03\u3055\u305b\u3066\u3044\u305f\u3060\u3044\u305f\u300cDSD\u539f\u7406\u57fa\u677f\u300d\u3092\u7528\u3044\u3066DSD DAC\u3092\u4f5c\u6210\u3057\u305f\u65b9\u304c\u3001\u30a2\u30ca\u30ed\u30b0\u51fa\u529b\u306e\u6e2c\u5b9a\u30c7\u30fc\u30bf\u3092\u516c\u8868\u3055\u308c\u3066\u3044\u308b\u306e\u3092\u5076\u7136\u767a\u898b\u3057\u307e\u3057\u305f\u3002WaveSpectra\u306b\u3088\u308bFFT\u306e\u30c1\u30e3\u30fc\u30c8\u3067\u3059\u304c\u3001 … “DSD discrete analog FIR filter DAC” \u306e<\/span>\u7d9a\u304d\u3092\u8aad\u3080<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[],"class_list":["post-1653","post","type-post","status-publish","format-standard","hentry","category-hardware-debug"],"_links":{"self":[{"href":"http:\/\/fpga.cool.coocan.jp\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/1653","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/fpga.cool.coocan.jp\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/fpga.cool.coocan.jp\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/fpga.cool.coocan.jp\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/fpga.cool.coocan.jp\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1653"}],"version-history":[{"count":25,"href":"http:\/\/fpga.cool.coocan.jp\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/1653\/revisions"}],"predecessor-version":[{"id":1693,"href":"http:\/\/fpga.cool.coocan.jp\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/1653\/revisions\/1693"}],"wp:attachment":[{"href":"http:\/\/fpga.cool.coocan.jp\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1653"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/fpga.cool.coocan.jp\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1653"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/fpga.cool.coocan.jp\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1653"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}